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                           STM-1/STS-3 Dual Bus Ethernet Mapper of 4-port with LCAS 
                            VLM155S (GC68561B-PG)  
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                          The  VLM155S is designed for SONET/SDH add/drop  multiplexer, multi-service access platform  for unidirectional single/dual ring applications.   
    Ethernet  payload can be mapped/demapped into/from SONET/SDH. Virtual Concatenation Group  via the RMII port. SONET/SDH Low Order or High Order VC Virtual Concatenation  SPE are supported, Virtual Concatenation SPE formats support up to VC3-3v/  VC12-63v/ VC11-64v.External  RAM interface is also provided to compensate  transmission delays for different VCG  members. 
                              VLM155S  can compensate the maximum transmission  delay up to ±250ms  by 128Mb ofexternal  SDRAM.  | 
                     
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                              | 1. | 
                              Support single RMII Port, the RMII port can be configure to support 10/100M operation.   | 
                             
                            
                              | 2. | 
                              Support  Ethernet Frame (RMII) Encapsulation/De-capsulation Protocol of  
                                      
                                        
                                          | - | 
                                          ITU-T G.7401, Generic  Framing Procedure (GFP)   | 
                                         
                                        
                                          | - | 
                                          ITU-T  X.86 Link Access Procedure SDH (LAPS)   | 
                                         
                                       
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                              | 3. | 
                              Virtual Concatenation Group can support up to VC3-3v  or VC12-63v or VC11-64v  | 
                             
                            
                              | 4. | 
                              External RAM Interface is provided to compensate Transmission Delay of different Virtual Concatenation Group Members. Up to ±250ms  Differential Transmission Delay can be compensated using 128 Mb SDRAM.  | 
                             
                            
                              | 5. | 
                              Low latency (e.g. less than 150us for the Ethernet frame of 64 bytes) supports excellent performance for Ethernet switching applications.  | 
                             
                            
                              | 6. | 
                              Support ITU-T G.7042 LCAS to provide hitless operation of dynamic bandwidth management.  | 
                             
                           
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                              | 1. | 
                              Multi-Service Ethernet Switch  | 
                             
                            
                              | 2. | 
                              Multi-Service Access Platform  | 
                             
                            
                              | 3. | 
                              SONET/SDH Add-Drop Multiplexer  | 
                             
                            
                              | 4. | 
                              IP DSLAM  | 
                             
                           
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